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Hi There,
i have exactly the same problem like this two people:
http://ubuntuforums.org/showthread.php?t=2040656
http://askubuntu.com/questions/13963.../165002#165002
and i tried to fix it with the following:
(with the file from: http://askubuntu.com/questions/13963...not-recognized)
cd /home/rtl_92ce_92se_92de_8723ae_linux_mac80211_0006.0514 .201 (work)
sudo su (work?)
make clean
make: *** No rule to make target `clean'. Stop.
make
make: *** No targets specified and no makefile found. Stop.
sudo make install
make: *** No targets specified and no makefile found. Stop.
sudo modprobe r
(Hardware)

I just recently purchased a toshiba L840d, and it comes with the Realtek 8723. I installed the driver from http://askubuntu.com/questions/13963...not-recognized and that works with unsecured networks but where there is wep or wpa security it will not connect.

Over the past few months, I've come across a few threads of people having problems installing Dropbox. A common feature seems to be that they subsequently can't update anything!
Here's the latest: http://askubuntu.com/questions/55049...able-to-update